The Vigoor Empire, (in Japanese: 神聖ブイゴル帝国; Romaji: Shinsei Buigoru Teikoku) also known as the Holy Vigoor Empire and the Vigoorian Empire is a cult-like dictactorship somewhere in western Asia that serves the will of their namesake master who they called the "Holy Vigoor Emperor". They are a major antagonistic faction in the 2007 action/adventure videogame Ninja Gaiden Sigma. This tyrannical religious empire also serves as the home base of the Greater Fiends Doku and Alma. The Empire's capital is the city of Tairon. The Vigoor Empire, due to its isolationist policies, is only accessible via airship, which service is apparently state-controlled.